Diaphragm-plate for phonographs, &amp;c.



No.-634. 326. Patented Oct. 3, I899.

- W. W. CRIDGE.

DIAPHRAGM PLATE FOR PHONOGRAPHS, 6w.

(Application filed Mar. 1 1, 1898.) No Modal.)

"9 WWW lill UNITED STATES PATENT OFFICE.

\VALTER XV. ORIDGE, OF PITTSBURG, PENNSYLVANIA.

DIAPHRAGM-PLATE FOR PHONOGRAPHS, 800.

SPECIFICATION forming part of Letters Patent No. 684,326, dated October 3, 1899.

Application filed March 11,1898. Serial No. 673,490. (No model.)

To all whom it Duty concern:

Be it known that I, WALTER W. CRIDGE, a citizen of the United States of America, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Diaphragm-Plates, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in diaphragm-plates, such as are used in connection with phonographs and like instruments; and it has for its object to construct a diaphragm which will produce a clearer sound from an instrument of this type.

In the drawings accompanying this speciiication, Figure 1 is a vertical sectional view of the recorderand reproducerequipped with my improved diaphragm. Fig. 2 is a perspective view of my improved diaphragm. Fig. 3 is a vertical sectional View of the same.

Although myinvention relates specifically to the diaphragm-plates for such instruments as phonographs, I have shown in connection with the drawings a portion of a recorder and reproducer which is secured in the plate or receptacle 1 by means of the annular frame 2, screw-threaded on its inner periphery to receive the frame 3 of the tube at.

The diaphragm is composed of two circular pan-shaped plates 9 and 1.4, each of which has its edge bent at right angles, these edges being adapted to abut together and form an annular flange 12 upon the rim 11, which engages in the screw-threads of the annular frame 2 for holding the diaphragm in position. The upper plate 9 of the diaphragm 9 is provided with apertures 10, and the underneath plate 14 is preferably provided with like apertures 15.

The underneath plate lat of the diaphragm may have attached thereto in any suitable manner a post 16, extending downwardly through the hinged plate '7, and is connected by a pin 17 to a lever 18, which carries the recording and reproducing point 19.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

A diaphragm for phonographs and the like consisting of two circular pan-shaped plates having their edges bent at right angles and abutting to form an annular flange midway of the rim for securing the diaphragm. in position, substantially as described.

In testimony whereof I affiX my signature in the presence of two witnesses.

\VALTER IV. ORIDGE.

\Vi tnesses:

JOHN NOLAND, H. H. PA'JF'JFERSON. 

